摘要:
A semiconductor memory device includes: a memory cell array having a plurality of memory cells arranged therein; and a sense amplifier circuit configured to read data of the memory cell array, wherein a comparison operation is performed between read out data from the memory cell array and externally supplied expectance data in the sense amplifier circuit.
摘要:
A lubricant supplying unit preferable for a linear motion apparatus such as a linear guide unit and a ball screw unit, always capable of coating all rolling body rolling grooves formed on a track shaft with an equal amount of lubricant regardless of a difference in the mounting posture of the track shaft with respect to a fixing unit, is provided. A lubricant supplying system for achieving such an object comprises a casing fixed to the slide member, a plurality of coating pieces which are protruded from plural positions of the casing so that they are in contact with the track shaft for coating the track shaft with lubricant and a lubricant accommodating chamber provided in the casing for supplying lubricant to the coating piece, wherein the plurality of the coating pieces are divided to groups consisting of one or two or more adjacent coating pieces and the lubricant accommodating chambers is formed for each of the groups.
摘要:
The present invention relates to a ball chain used by being integrated to, for example, a ball endless track of a linear guide device for endless sliding in which a number of balls are arranged in one row and rollably held, particularly to a ball chain which is most pertinent to a linear guide device having a ball rolling groove in a shape of a Gothic arch. According to the ball chain, the number of balls are arranged in one row and the balls are held rollably, each of the balls is pinched by a pair of spherical seats and the spherical seats are connected to each other by flange portions to thereby constitute a ball holding unit and a plurality of the ball holding units are connected in a shape of a rosary by a flexible connecting portion. Further, the spherical seats and the flange portions are molded by a resin material whereas the connecting portion is formed by a material having a tensile strength larger than that of the resin material.
摘要:
An endless sliding guide apparatus including a track rail, a sliding table having an endless track comprising a load rolling path, a no-load rolling path and a change direction path and rolling bodies wherein at least one of the no-load rolling path, the inner peripheral portion of the change direction path and a rolling body retaining section of the load rolling path is formed by synthetic resin rolling body guide members formed by insert molding using a bearing race as a core. The rolling body guide members are molded by a synthetic resin composition satisfying the relational expression of (a.times.b).div.c.gtoreq.700 Mpa with respect to the tensile strength a (MPa), tensile elongation b (%) and shrinkage c (%). The endless sliding guide apparatus of the present invention has the advantages that since the endless track of the sliding table is accurately formed, the rolling of the rolling bodies along the endless track is quite smooth, the noise level is minimized and not only the manufacture of the sliding table can be automated but also the problem of "corner cracks" in the synthetic resin rolling body guide members can be eliminated thereby extending the working life of the apparatus.
摘要:
An endless retainer of a guide device including a number of rolling bodies arranged at predetermined intervals for rolling at an inside of an infinite track formed in the guide device, a flexible resin connector having interposing portions interposed among the respective rolling bodies and connecting portions for connecting the respective interposing portions for holding the number of rolling bodies in an aligned state and rotatably, and the resin connector is molded by an injection molding with the rolling bodies as cores by using a resin having a dimension change rate before and after an oil absorbing or a water absorbing treatment larger than a mold shrinkage rate and is provided with clearances between the resin connector and the rolling bodies formed by the oil absorbing or the water absorbing treatment whereby handling thereof is facilitated without detaching the rolling bodies, automation of integrating the endless retainer to the guide device can be carried out and extremely smooth rotatability can be provided to the rolling bodies with certainty.
摘要:
A non-volatile semiconductor memory device according to an embodiment includes a data write portion, the data write portion includes, in a write loop, a first operation mode of sequentially performing a program operation and a first verify operation, and a second operation mode of sequentially performing the program operation, the first verify operation, and a second verify operation, and the data write portion includes, in the first verify operation, precharging a bit-line connected to the first memory cell and a bit-line connected to a second memory cell adjacent to the first memory cell and verifying data of the first memory cell, then in the second verify operation, when the write to the second memory cell is completed, without precharging the bit-line connected to the second memory cell, precharging the bit-line connected to the first memory cell and verifying data of the first memory cell.
摘要:
A semiconductor memory device executes a writing operation based on a first bit assignment pattern at the time of writing. The first bit assignment pattern is created such that pieces of x-bit data assigned to adjacent threshold distributions have only a one-bit difference therebetween and an alignment of data on the same digit of 2x pieces of x-bit data corresponding to an alignment of 2x pieces of threshold distributions contains at least two transition points of “0” and “1”. The semiconductor memory device operates at the time of reading such that a read voltage corresponding to the transition points of “0” and “1” is applied to the word line on a page basis to determine x-bit data stored in the memory cell one-bit by one-bit based on the first assignment pattern. The page contains a set of data on the same digit bit in pieces of x-bit data stored in the memory cells connected to the word line.
摘要:
A semiconductor memory device includes: a memory cell array having a plurality of memory cells arranged therein; and a sense amplifier circuit configured to read data of the memory cell array, wherein a comparison operation is performed between read out data from the memory cell array and externally supplied expectance data in the sense amplifier circuit.
摘要:
A write controller performs verification for checking whether each memory cell is on a predetermined verification level. For a memory cell to be written to a voltage level higher than the predetermined verification level, the write controller stores, in first and second latch circuits, the number of times of write to be performed by a write voltage after the verification. Whenever write is performed by the write voltage, the write controller updates the number of times of write stored in the first and second latch circuits. After write is performed the number of times of write by the write voltage, the write controller performs write by an intermediate voltage lower than the write voltage.
摘要:
A semiconductor memory device includes: a memory cell array having a plurality of memory cells arranged therein; and a sense amplifier circuit configured to read data of the memory cell array, wherein a comparison operation is performed between read out data from the memory cell array and externally supplied expectance data in the sense amplifier circuit.